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The inclusion of a High-Frequency Power Ampliﬁer (PA) is a crucial component of any wireless communication set-up. Its job, as the name suggests, is to amplify all in- and outgoing wireless trafﬁc. If omitted, the communication signals would simply be too weak to be of any use. One does not want to waste any unnecessary energy during this process and, one way to do this, is to regulate the supply level of the PA. Such an arrangement is commonly known as Envelope Tracking (ET). Modelling the behaviour of such a device in actual operational conditions is an important step towards achieving even better performance. Identifying such a device gives rise to models that are both Multiple-Input Multiple-Output (MIMO) and Linear-Parameter Varying (LPV) with, in the most extreme case, multiple scheduling parameters. Furthermore, to mimick actual operational behaviour, the device will be excited by carefully designed multisines which, combined with the versatility of the Best Linear Approximation (BLA), result in models which are also valid for the eventual communication signal. Validation of the proposed framework is done on two simulation examples. Firstly, a so-called Class B PA in which only the supply level of the device is modulated, is identiﬁed using a MIMO LPV model with just a single scheduling parameter. Secondly, a Class A PA, wherein both bias and supply voltage are modulated, is considered and introduces the concept of multi-scheduling to the identiﬁcation procedure.
|Status||Published - 23 sep 2018|
|Evenement||27th ERNSI Workshop on System Identification - Pembroke College, Cambridge, United Kingdom|
Duur: 23 sep 2018 → 26 sep 2018
|Workshop||27th ERNSI Workshop on System Identification|
|Verkorte titel||ERNSI 2018|
|Periode||23/09/18 → 26/09/18|